scope:

This European Telecommunication Standard (ETS) contains an electronic copy of the ANSI-C code for the GSM Enhanced Full Rate codec. The ANSI-C code is necessary for a bit exact implementation of the Enhanced Full Rate speech transcoder (GSM 06.60 (ETS 300 726) [3]), Voice Activity Detection (GSM 06.82 (ETS 300 730) [7]), comfort noise (GSM 06.62 (ETS 300 728) [5]), Discontinuous Transmission (GSM 06.81 (ETS 300 729) [6]) and example solutions for substituting and muting of lost frames (GSM 06.61 (ETS 300 727) [4]).